Details

Autor(en) / Beteiligte

• Wei, Liangliang
• Xia, Xinhui
• Zhu, Fengyi
• Li, Qiaoyang
• Xue, Mao
• Li, Jianju
• Sun, Bo
• Jiang, Junqiu
• Zhao, Qingliang

Titel

Dewatering efficiency of sewage sludge during Fe2+-activated persulfate oxidation: Effect of hydrophobic/hydrophilic properties of sludge EPS

Ist Teil von

• Water research (Oxford), 2020-08, Vol.181, p.115903-115903, Article 115903

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• To clarify the effect of the hydrophobic/hydrophilic polarity of extracellular polymeric substances (EPS) on sludge filterability improvement during S2O82-/Fe2+ oxidation, waste activated sludge (WAS), glucose-fed hydrophilic sludge (HPI-WAS), and sodium acetate-fed hydrophobic sludge (HPO-WAS) samples were cultivated, and their dewatering behaviors were individually explored. Experimental results showed that S2O82- oxidation effectively disintegrated the polymeric EPS and led to a more significant reduction in the water content for HPO-WAS than for HPI-WAS (12.87–15.23% vs 9.31–12.12%), especially regarding the bound water (Wb) content. After oxidation, as high as 38.88–42.61% of the Wb within HPO-WAS samples were declined, much higher than the HPI-WAS samples (19.27–29.20%). Specifically, carbohydrates within sludge EPS negatively influenced the dewatering process of S2O82-/Fe2+ oxidation. By contrast, abundant existence of humic acids and polymeric proteinaceous components (especially those hydrophilic proteins and transitional humic acids) within the sludge EPS exhibited a converse trend. FT-IR and EEM spectral, as well as particle sizes variation for the sludge samples before and after S2O82-/Fe2+ oxidation was also evaluated. This study provides new insight into the enhancement of S2O82-/Fe2+ oxidation for sludge dewatering based on polarity analysis of EPS. [Display omitted] •Sludge with varied hydrophobic/hydrophilic EPS polarity was cultured and fractionated.•HPO-WAS was readily destructed by S2O82-/Fe2+, led an effective bound water releasing.•Higher hydrophobic content and PN/PC of EPS benefited for S2O82-/Fe2+ conditioning.•Carbohydrate within sludge EPS negatively affected sludge filterability improvement.•Downshift of Mw of EPS was observed for S2O82-/Fe2+ oxidation, especially for HPO-WAS.